Asterisk programmer & consultant

I am looking for a programmer who can help me program a PRI line (30 channels) using Asterisk or any other tools / software. Flow of calls: A - Caller B - Server C - Call recipient The server (B) simply connects the A and C by putting them in conference. The call needs to be recorded on the 'B' side as well for records. Each C has a dedicated number on PRI line and all calls coming on a defined number on PRI line... land to a defined C. We need to handle call overflow as well. You need to suggest me the board you want me to purchase.. and program it by remoting the PC. I have a inhouse IT team (all experts) who can work with you and setup the same. Ricky